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Summary of Significant Accounting Policies Summary of Goodwill Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill - Beginning Balance	$ 3,389,595
Impact of Change in Foreign Exchange Rates	15,515
Goodwill - Ending Balance	3,405,110
Telx Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	330,845
Impact of Change in Foreign Exchange Rates	0
Goodwill - Ending Balance	330,845
European Portfolio Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	466,604
Impact of Change in Foreign Exchange Rates	15,515
Goodwill - Ending Balance	482,119
DFT Company
Goodwill [Roll Forward]
Goodwill - Beginning Balance	2,592,146
Impact of Change in Foreign Exchange Rates	0
Goodwill - Ending Balance	$ 2,592,146

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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